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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579012e148e51bf3a1d8ca28b8dc7ce8029b7d9f9cdeb2462eeb4607a0c1d853' 
  AND token = 'RPrfUDH318sbVEo5ViJ8YYsUHEVN9iSZ4TT5/TDKYS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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