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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f414c5b9db35793010318b5250232544c64b69bdece4f6886ece8b2a29cc931d' 
  AND token = 'g69po7AT/ijhPV509QHvTYyY3hG0a395XKaSXEIN9Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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