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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851c506a71b4e5c3b45a80f3512882c999df70a59056ab0f33a9b813ed562385' 
  AND token = '7WuXi5Cf/2v8ytkvz5BUmVb8aNmpqoG1ab5zfJ15krg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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