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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c97cff1d1c0bc9aaccb3feece628b2c72c3989d84f1b36afb9017ef346e9b1a1' 
  AND token = '4F7/DJHnqb6qL8kDKuQWCi4QAoQRqLzyZODW6EpKYRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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