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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28af376bbfa7f98afc0b8e31a818a1e1bdf588975c4ffe580b9cc416edad14bc' 
  AND token = 'kCJxjT/oFQ/tSxwJCVRsA/crf78HEV4a2jaN0WHhpSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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