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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac3abde84078ddae704f187326d6c4853427697b854a6cc125104f6d328fde2d' 
  AND token = 'B+4Ou3AxjNLM7wyBPtJFI95s+MH2W4z2U+uM1UlRwU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}