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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514ac769bbea39d3bc7b5a120941289ebf111c2bdb6a603ca30ad3662cab3c0e' 
  AND token = 'qwIE6H5x+3mVi9PlncToJsT8kI1bGtXm/v7wtc1ecJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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