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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '741c4a5ab7a73328343e73480c10e92564a28a05da59772d8cc1e0add5330df3' 
  AND token = '+aiyYdQopDt3xWE0yJflZ5ee7I1HEM1txttiOe6lfHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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