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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e63f70de4a2ce26da33cfd39d8e57d7bce191c507d27fd4afa96c756edd303b9' 
  AND token = '4eTryzhcBfg03HH4dLEAQ0Sce+TdYSmn2a29bzCddQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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