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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '250e872172155c2d1468b55aed66c6722e250e89863047bb1e8088e9d9e65f0c' 
  AND token = '1BjBLyjji79Ex5pXcBxboMgBxKtYVdGWM59j8ufzQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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