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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9f65894bfe38715437a43be8d4f6384406ee6860caa9f418b37e35fdf008644' 
  AND token = 'SX1OcVGAikIbsyL+MRvhxOmM+Its5gvQp0eu3R+6FCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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