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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84fc22730790518ae320a411c4ae5ec5b564101993262ebe263330e2ce5f296a' 
  AND token = '+E6rDupHX1XTn1Wcd+eCqdvKpWvVaT7a00OAYr8ujJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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