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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b98a8a7d4c1b814651106f26a26a30a457552167aa483fe518b543b80ef502ea' 
  AND token = 'cLwgN19o4A3s42KpoHc3Geg0tO3WQMrR1zKidXUjxN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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