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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5fcc58bc38e8e9606366f370e5d0396b199cf276c9171164546993124532df5' 
  AND token = 'syXcX8PDi4ht2qj9pVd4Ym0lrdH0O3dXrsjdrk1Qamo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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