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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48436b99656828f0a5029001c831d3bdeb71b82b9e7804229935d02a28fb74ce' 
  AND token = 'IM0vbC/t5/eS6TVCtII2fbRlPPmmuigiUwZXOk4ql6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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