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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35e6752367f3cc1d464af2af424bdde4a893465b762edcc361fd1120cd5165ec' 
  AND token = 'tpGkbR/IbS8v1RhYKaZFEUSPeK5hzsdEwTE4Bq4m14E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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