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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '586997ec7aafa2c35f096fa210f4b6d5e71dc94a0f5287af762ae1428e92c218' 
  AND token = 'Lc/339y/jW9MrU6ji6znManZnuKBkslEim3KEuNxFE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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