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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d6aca89ccdfe2cd0997c01630760fa84a82fd371a29ec070d50b74a9a35fff3' 
  AND token = 'iebUxf+yeMhdarD8PgZLuYyO5yvZHkViTkFrZmAi6fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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