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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13ce19313d990a30c58d9b90e2ab2deabb23aa347c935032c1ac3bd94652e839' 
  AND token = '8DqOnrkW6GuQQhOaZbnF4+WYCcb07UQeUxlkPYQF+4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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