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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '844b13c58452c34ed154c1a3d9e05b56410368d2f1a293a1110994b10985eb93' 
  AND token = '8q6Ka7tYEdXak7LbUqntQDdbej83DZy2R28WqnttSZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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