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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f03ac00aac616f346ad2cdd245042e7c7b7738e93e97cc242ce123d908f1f46b' 
  AND token = 'XKdRmQogwz8nD9sG4eNP6hr9MmtTKrnCWGqyO/MhRyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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