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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52df2d585341d97ee2f0bf260faae1b22035adbd490db19aee01232a615ffd1e' 
  AND token = 'XDfbXJsSqMt3rEz5Tt5+omzuTnlSsIzB7gdiEsuDSCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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