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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea3e2f225b32f0a72e1a0d904dffe0f1e824934774c9b4b1da11cfe112c096f' 
  AND token = 'Z+ay9+6gWYqo58peJhf3lRy3d07A2/YjPXA80raLdZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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