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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33147c27f3957e40929faf3aaa357d5c95709ec072638b0cdb3965d50f227932' 
  AND token = 'Pru3rGHsuIZatuhYMG/HlbfyUMotybureLjT7KYpbEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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