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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34ca9bc86e1d2097e25aa7d8e98fd60adfd84993c4ed575bd42cacb14a325947' 
  AND token = 'buai2Pj6XawtwEnZlbh0QX1V3KbuvLBL1NGFVUeczcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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