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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4be809a9e803aedbe78bee9057f94faab20d59deb2f6acf02fa0e928a0b8259' 
  AND token = 'xxg5w1h3gHZzrzOEcImywu97LwT2BGueQFbF3PVG92w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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