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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06406eaaf643e407f670ee74fa3868ddee2d60dffe36f7659b0275b5dec07038' 
  AND token = 'x0x6m1get7Js2epK6A3EkuBs/6Nrg4Zn88NW39yfvgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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