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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56570de4c3390cd87ad9739b5571d0e075d1720d0cb1e025097a240b148f68d2' 
  AND token = 'sksbguSxG4OyyoCz+f1FkC81lo1jNgKS742MLtqHCD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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