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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53d941bd4453e5ff7a4e9860dbda0dd28ca3dddc56c43a53c65676ae730db6d5' 
  AND token = 'VQXbiUaeNHOY1B8Ay8ydkObx9P6f0hLKA9ur9lEvseE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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