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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '078eac22873ddae570575a69573fcbea0b04b0d2d4ab26d4848246bb13b8dd60' 
  AND token = 'da+6/95RBQorSXzMoOwvPjDaW+0It7kra09hpovG0VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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