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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34c61d15fc978bccee8b5de3a69427a814dab68246a629995c546e7b58703aeb' 
  AND token = 'Zb8c5W0kOnYkNs0O0iWilV4c5RJ0r4z/HJcMV/HjVtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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