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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0cf760e01a5ad3edb251d02ad02d0ed09d85bd45e3fc77a4c84bbd5a03b932a' 
  AND token = 'U4o7Wr/vfWDvptXHD0UZNa+QKciW2uSWor8Iq4xUOag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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