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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd76cd765d2a0ffd7e25668b45416db180381cfb8026eae8485896964388ef960' 
  AND token = 'g6T/mAHl8oFjZWnHl5M2nC724lLPbc6brE/k/hVOxog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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