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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '200ba02cfd23d9c9a54b589af3ef08eed915258c66a8dc3d7a2da548140ffcd8' 
  AND token = '7hSeDelkrd12FbYDQhwd7o1q4NNLqtYcKZ/MLVttm88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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