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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86fb3503777e0ef305e7e08bb18bf8488f2f32ba69437b1c65fdb088cd8cac1d' 
  AND token = 'bzo9s0e2KdH/5k5vdJeyMF9HxGIz0dff8ruSOUuynRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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