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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd79ca012d47a2a850ba62df95ea7d97e3659e2d8422b495eca3cf4db49a30179' 
  AND token = 'A/2Kc8LI7/3sFGlPmzOtPUmrh6mGMoJw5NHffvadyDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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