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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '911bea018d30af9d88b1070fc15c923e2c0c97281fd191bf51d5c74b37da085d' 
  AND token = 'MGpssn72hLvkoMAFfw5b0X/V4QOUG9GRIhrBlv73C2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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