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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '103bb8f500369a0289d952522506e66641c861176e55f206ad2f4fbc016b6eda' 
  AND token = 'eriKw7bAcIE2+uA+tuLEbK61a0mM1tS2iCKug5wyg3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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