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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56850f237dae3c83cc5815ff5ac2e429ff163ef1101d75b01470004fa050cd03' 
  AND token = '8ZLsmF65hFdiX3r/i2U/+SWKF+bxgStxPAlHAWI1B2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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