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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a10d7f8e9b695eb7ac68a4dd7d29acfc5e0ad039a8c3ba22df4afee6a39fd2' 
  AND token = 'Mn/yDQM7uKYdP+Fau8YJ+SwVLYckRa4MUwRZZLFOmGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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