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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108ffbd8d5607309c1378bad84097cade9c5abeb3573cd6b9111657a1941c1e7' 
  AND token = 'CtBIM2J44oNPQK56plH2jIGOSdv4u4tl5dSavPAGOUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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