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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f0ead25f9a1fa7eff16f55a9fa608a1e751d5b647dff3c0417f68bb2c61cb9' 
  AND token = 'sc9gcfeh5dLDIgm6RMMY1eHHnT535dHKhO6Z5kJDAHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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