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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983c12d88399f002a581a40d8d49d3f98d49eddf40a5695d6b33e8d12a0fa7de' 
  AND token = 'BGGWiO4BYrXapBJgwoAUBSR8RzTOK/l11s2oOeS2CIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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