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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dcfa23702f7f68bc0dee7f3cb24aa2dc51b32cc337a0459a5d7f2faa92ad1ff' 
  AND token = 'XP5SSx6cEvW/4JZ5j8ELUGn+RVnm0brUg0G31OVukbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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