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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d51f1c3ec7ee6668ea2d30992f88ab0dd745a1e0d76be841ab8f7ce4440ddb6' 
  AND token = 'yeT9R+/FbBzlbu+DLMaZ+O13aoBYMa8ncpbcsfUT2WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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