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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf48bc7786d848f127e55b81107c50e6ee80c07cbcf2efe30879895118294965' 
  AND token = 'iLpXb4xA4x0AWc/d2gZpkP/DaD+3VahQuvpTzyG9C8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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