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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba02e6a78b78bd79fe4056a12c59a2e5597dd406baa21b98ff87b457b09d66d0' 
  AND token = 'YFQdUf4cyoOPmJ8eyWU9DPSh9jZJPqGYMsm7jhb9mE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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