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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e59043bb137e9f4815f0679cbb402e4e14a2b1f4b508f1e47ba7a6f1bb517172' 
  AND token = 'rZ9oSAt7GyvKh6knvN0XeOagN0PCVAl3sQPfLyD5RdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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