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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02ac814f92a269139f70c06a1634ea6d1a42582ac4a4f8d1fba64f3b045133f7' 
  AND token = 'tUEIh2iSw5qEgTsDlL5aY5CFui7Ftk1P8vHwPUMEnGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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