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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00579ca4c4b35c4c0d748a357769b259c3779097be09226b3f0eb603ea42e376' 
  AND token = 'T+OUTdSGWKtXlD8D+pn0vq1a+jWJ3SUtqr2duJvusiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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