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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0e4b0682fc80d099afa4ab8f43a5783116dc2e4bd75f5d1817d24e0c5691878' 
  AND token = 'dhAEEqfg0Oo5xyGSkAi+1LuibjNKV45/I+ip5cCjDQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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