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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02279f0da03cc43731d386844dae6568017c3e7e470b53eecb32a09389d608ef' 
  AND token = 'IjUyvUOXJqIIQD+H7Nw6sbS8e8WF3e9vtapJI1rHVEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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