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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e7cd5bc29ba1c35d27a841cc0c1501ecb7438296e136a411571858e57e71ec4' 
  AND token = 'hsnFQxy8LSKx0GN5/ki/d/85vikUAY1aKrOMOCAjEKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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