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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '339a727975e1188b9a6f2102211b8669e7e359abd3105605a70b303f94e59196' 
  AND token = 'F7EJlgka2RoQLU4pchMC31yW23DcD/8XpTwPngCTDyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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