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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1e492b91e6190da57c15b8934a6c9fb72107bda4d9ea999994ccce71d036274' 
  AND token = 'qQsAiFZxBI2FQpiQmVbpMGC208x6+/sSfiQT2r0mpsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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