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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a824c4edc86ce2cd64263109b7a9369ab87ca69d70c087f30651cc09278c49c6' 
  AND token = 'nyy2Y7puZB9KAzr8pJxq3yRXDm0nDO9OxbDRduLYMPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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