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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '344c2b4576c4de229fb5becfe4f2c6ba0e48e0f794583c53743c5dd261f8909f' 
  AND token = 'MeYPlarwcsQs3xQu8vkI7HpoI76CWhZEDJIiXC46WN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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