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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01ca42f277b7c4b4312f921826480db138608f37de7843b21148f342eb064422' 
  AND token = 'meGbjFX98abWu7Xr0y94SMOj6bKO+peaE32Yklh+ZYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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