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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f9c27bae8b5ea9539a11dec745a4c0e400210e1148116a088924d81669aafea' 
  AND token = 'MVpfdaPnHBssYUIJ8VGvD9XK2kWuHOHq3b64M1/c+r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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