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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19d38eb6e77beffb50ef485f06646a871bd9c0cf025c22fe500a9299c1efed9f' 
  AND token = '65f2ro3z31ao9QXEl4/pKPTxkFCa3a96O+WdaLbD5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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