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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '292c9c5730ea77069311d312eb2d5b362cc43f4741dac70f75e2774106deb016' 
  AND token = '1y2poAp3HcMBVmjxn8nQKRe5nH7vLiQ6n7BaVJCt/Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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