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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7a5228f7f4c518acf4c04874be809f70c3f83f1cc96dcc7dd25b027a1bf1b78' 
  AND token = 'gu4v+QpLKhf6NNQgA3NnFKuP8B6G9UTPGrShkU92ikA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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