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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b7847bf57038f468c583f405359059ab661983e6c50e27b8f4f20fbbb3e569f' 
  AND token = 'DexrsghUFfJkeTE0JHafcwc7EebpNYxK12GYUxJ3RbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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