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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a98a910e8604b28221e7a1816aa471acef16fa67d0243c6bc38bf85ee9274bb' 
  AND token = 'Dar1kmCkK6TLWTD8jNsGQkxp1PL8oMxq63O/MEd93Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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