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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba0a1895efbf7f54d6f3c7a087b89bf823464c8950a896a2a880e4fd47221b95' 
  AND token = 'UhkN6t2i246x9h8LIUguhqA28aJ1GE5s7Z2pkZMpsw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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